Volga is the best place to earn this.
You get the nightvision upgrade on this level on the way through the Terminal.
First of all make sure you have a 4x sniper scope attached to a weapon.
To get it quickly. Get the key from the imprisoned cultists in the bandit camp. This allows you to enter the room with the Nightvision upgrade early. From here place your gasmask on and then activare your nightvision. Kill the first three enemies you encounter while aiming down the scope to unlock the trophy.